


For the advance of underground utilization technology
~ JTA 50th Anniversary 1975-2025~
Update information
- JTA 50th Anniversary Greetings
  Tunnelling Activities in Japan 20242025.05.09  Exhibition(WTC2025)2025.05.07  TODA2025.05.07  MAEDA2025.05.07  SATO2025.05.07  SHIMIZU2025.05.07  ORIENTAL CONSULTANTS GLOBAL2025.05.07  PACIFIC CONSULTANTS2025.05.07  NEXCO WEST2025.05.07  NEXCO CENTRAL2025.05.07  NEXCO EAST2025.05.07  OBAYASHI2025.05.07  KAJIMA2025.05.07